Polar bear

The polar bear (Ursus maritimus) is a carnivorous bear whose native range lies largely within the Arctic Circle, including the Arctic Ocean, its surrounding seas and surrounding land masses. It is a large bear, approximately the same size as the omnivorous Kodiak bear (Ursus arctos middendorffi). A boar (adult male) weighs around 350-700 kg (772-1,543 lb), while a sow (adult female) is about half that size. Although it is the sister species of the brown bear, it has evolved to occupy a narrower ecological niche, with many body characteristics adapted for cold temperatures, for moving across snow, ice and open water, and for hunting seals, which make up most of its diet. Although most polar bears are born on land, they spend most of their time on the sea ice. Their scientific name means "maritime bear" and derives from this fact. Polar bears hunt their favorite food of seals from the edge of sea ice, often living out of fat reserves when no sea ice is present. Because of their dependence on the sea ice, polar bears are classified as marine mammals.


 
Due to the expected habitat loss caused by climate change, polar bear is classified as a vulnerable species, and at least three of the nineteen polar bear subpopulations are currently declining. Nonetheless, at least two of the nineteens subpopulations are currently increasing, while another six are considered stable. For decades, large-scale hunting has raised international concern for the future of the species, but the populations rebounded after controls and quotas have begun to take effect. For centuries, polar bear has been a key figure in the material, spiritual, and cultural life of circumpolar peoples, and polar bears remain important in their cultures. Historically, the polar bear has also been known as the white bear.